<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .a {
      font-family: "汉仪正圆-55W";
    }
  </style>
</head>

<body>
  <div class="a">123</div>
  <div>123</div>
  <script>
    function Person(name, age) {
      this.name = name
      this.age = age
    }
    const user = new Person('zp', 18)
    console.log(user.__proto__ === Person.prototype)//true
    console.log(user.__proto__.constructor === Person)//true
  </script>
</body>

</html>